Functionalized bis-cyclometalated alkynylgold(III) complexes: Synthesis, characterization, electrochemistry, photophysics, photochemistry, and electroluminescence studies

Ka Man Vonika AU, Daniel Ping-Kuen TSANG, Keith Man-Chung WONG, Mei-Yee CHAN, Nianyong ZHU, Vivian Wing-Wah YAM

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Abstract

A series of luminescent alkynylgold(III) complexes containing various tridentate bis-cyclometalating ligands derived from 2,6-diphenylpyridine (R-C^N^C), [Au(R-C^N^C)(C≡C - C₆H₄ - R′)] has been successfully synthesized and characterized. Complexes 1 and 6 have been determined by X-ray crystallography. Electrochemical studies show a ligand-centered reduction that originated from the tridentate R-C^N^C pincer ligands and an alkynyl-centered oxidation. The photophysical properties of the complexes have been studied in detail by electronic absorption and emission studies. Tunable photoluminescence behaviors have been observed, with the emission maxima spanning through the visible region from 476 to 669 nm in dichloromethane at room temperature, and the complexes were also found to be emissive in various media at both room and low temperatures. Transient absorption studies have been conducted to investigate the excited state properties of the complexes. Furthermore, selected complexes have been incorporated into the emissive layer (EML) of organic light-emitting devices (OLEDs) and have demonstrated interesting electroluminescence. Copyright © 2013 American Chemical Society.

Original languageEnglish
Pages (from-to)12713-12725
JournalInorganic Chemistry
Volume52
Issue number21
Early online date21 Oct 2013
DOIs
Publication statusPublished - 04 Nov 2013

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Photochemical reactions
Electroluminescence
Electrochemistry
electrochemistry
electroluminescence
photochemical reactions
Ligands
ligands
synthesis
Methylene Chloride
X ray crystallography
room temperature
Excited states
crystallography
Photoluminescence
methylidyne
photoluminescence
Oxidation
Temperature
oxidation

Citation

Au, V. K.-M., Tsang, D. P.-K., Wong, K. M.-C., Chan, M.-Y., Zhu, N., & Yam, V. W.-W. (2013). Functionalized bis-cyclometalated alkynylgold(III) complexes: Synthesis, characterization, electrochemistry, photophysics, photochemistry, and electroluminescence studies. Inorganic Chemistry, 52(21), 12713-12725. doi: 10.1021/ic4019212